The good way is for the user in trust vlan to stay in this vlan. But if i don't overwrite host, when we share a file, on the link, I have the address https://serveur1.on-trust-vlan and it's not possible for the user outside this vlan to contact this server.

I'm not sure to be clear but... the good way will be to have in the share link ttps://server2.on-dmz.domainename but connected on https://serveur1.on-trust-vlan
Thanks for all of your ideas.

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I am not sure there is an easy solution here. As far as I know, you can only configure an ownCloud instance to use a single hostname and there is not a way to change the hostname used based on context (IP space the user is originating from).

If the server must be accessible on the public web for shared files then it would be outside the VLAN with any standard configuration. If it needed to be within the VLAN then it would not be able to share files publicly.